|Voorkomen van de kieuwparasiet Lernaeocera branchialis bij wijting (Merlangius merlangus) op het Belgisch continentaal plat en de zuidelijke Noordzee|
Declerck, D. (1992). Voorkomen van de kieuwparasiet Lernaeocera branchialis bij wijting (Merlangius merlangus) op het Belgisch continentaal plat en de zuidelijke Noordzee. Landbouwtijdschrift 45(6): 1231-1240
In: Landbouwtijdschrift = Revue de l' Agriculture. Ministerie van Landbouw: Brussel. ISSN 0776-2143, more
Parasites; Copepoda [WoRMS]; Lernaeocera branchialis (Linnaeus, 1767) [WoRMS]; Merlangius merlangus (Linnaeus, 1758) [WoRMS]; ANE, Belgium, Belgian Continental Shelf (BCS) [gazetteer]; Marine
In the period of 1985-92 the occurrence of the copepod Lemaeocera branchialis in whiting in the Belgian continental plat and the southern North Sea was examined. The infected fish rate was significantly higher in spring than in autumn. A negative correlation with the seawater temperature, y = -0.27 x + 53.7 was found (r = -0.84). On the other hand the rate of copepod infected fish, found in the open sea was smaller than in the Belgian continental plat. This may be explained by the absence of the first intermediate host, 'flounder', during most of the year. Nevertheless the open sea sections are visited by flounder during the spawning period (March and April). With regard to the condition, whiting has been significantly influenced by the presence of the copepod. An increase of weight loss and a decrease of the liver fat content was noted. The presence of Lemaeocera branchialis was also reflected in the blood parameters, i.e. the reduced erythrocyte count, the decrease of haematocrit readings and the lowering of haemoglobin content.